Short Description:
1990 Concentrations of modeled diesel particulate matter (PM) air toxics emissions from road sources for each US Census Tract in Hartford county in the state of Connecticut.

Download File Size:
164 KB (Download Time: <1 minute @ 56K)

Data Details:
The basemap polygons are 1990 US Census Tract boundaries. The 1990 air toxics emissions particulate matter (PM) dataset was obtained from the offices of the Northeast States for Coordinated Air Use Management (NESCAUM) as they obtained it from the Environmental Protection Agency's Cumulative Exposure Project (CEP). The data was originally modeled under the Assessment System for Population Exposure Nationwide (ASPEN) in order to predict US Census Tract level diesel PM concentrations as micrograms per cubic meter (µ/m3). Emissions data for 1990 was inputted to the ASPEN dispersion model by the Environmental Protection Agency (EPA), which subsequently produced the estimated concentrations. The legend is classified in quantiles. The Hartford County outline was obtained from the 1990 US Census counties shapefile. The cities with a population of over ten-thousand residents was obtained from the 1990 US Census cities shapefile. The companion Names of Cities page listing the names of the enumerated cities was also derived from the 1990 US Census cities shapefile. As a letter-sized landscape print out, the scale is approximately 23 miles to an inch. Magnetic north is up.

Other Maps With This Dataset:
A regional map showing the representative dataset for the northeastern corridor of the country (the "New England States") can be viewed here.

A localized map showing the representative dataset for New York City can be viewed here.

A localized map showing the representative dataset for the state of Connecticut can be viewed here.

A localized map showing the representative dataset for the state of Maine can be viewed here.

A localized map showing the representative dataset for the lower region of the state of Maine can be viewed here.

Map Maker’s Notes:
While a distinction exists between data for non-road sources such as airplanes, farm equipment, boats, construction equipment, etc, (vehicles that don't generally go on roads) and road sources such as cars, trucks, buses, etc., only the latter data (road sources) was used to generate this map.

The green star represents the capital city of Hartford in the state of Connecticut.

For the User's Guide for the ASPEN version 1.1 model (April 2000), review this 110-page locally archived PDF document originally available from the Support Center for Regulatory Air Models (SCRAM) section of the EPA website at http://www.epa.gov/scram001/userg/other/aspenug.pdf:Local Archive: ASPEN-User's-Guide.pdf(1.47MB).

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